Keeper of the Lost Cities Books in Order

Keeper of the Lost Cities centers on Sophie Foster, a twelve-year-old prodigy who has never quite fit in with her human family in San Diego. She can hear other people’s thoughts, skips grades without trying, and carries headaches that never fully go away. When a telepathic boy named Fitz Vacker appears on a school field trip and reveals that she’s an elf, Sophie is pulled into a hidden world she never knew existed.

The Lost Cities are a network of glittering, secret communities where elves, dwarves, gnomes, goblins, ogres, and trolls live apart from humans. There are floating castles, cities built beneath the ocean, and sprawling preserves full of creatures thought to be myths. Sophie is taken in by Grady and Edaline Ruewen, a grieving couple who run the animal sanctuary Havenfield, and she starts classes at Foxfire, an elite academy for young talents.

What looks at first like a straightforward magic-school story quickly becomes something stranger. Sophie’s telepathy is stronger than anyone expects, and she keeps manifesting new abilities—teleporting, speaking every language, amplifying the powers of others. She eventually learns she was genetically engineered by a secretive rebel group called the Black Swan, who wove forbidden DNA, including that of an alicorn, into her design. Pieces of their plans, and of Sophie’s own memories, are locked inside her mind.

Opposing the Black Swan is the Neverseen, a ruthless organization willing to burn cities, unleash plagues, and twist elven politics to remake the world on their terms. Across the series Sophie and her friends are pulled into this conflict whether they want to be or not. They investigate ancient conspiracies, uncover the truth behind legendary disasters like the Everblaze, and race to protect vulnerable species and entire cities from collapsing into war.

Along the way Sophie builds a tight circle of friends: rule-following Fitz, chaotic empath Keefe, loyal gadget-maker Dex, stealthy illusionist Biana, twins Tam and Linh with their shadows and storms, and many others. Their banter and crushes sit right alongside serious questions about trust, loyalty, grief, and what it means to stand up to a system that keeps choosing safety over justice. The series leans into found family, giving Sophie room to love both the human relatives she left behind and the new home she’s building among elves.

Each book mixes fast-paced adventure, intricate worldbuilding, and slices of everyday life: exams at Foxfire, awkward matchmaking lists, goofy creature mishaps, and late-night telepathic conversations. The tone stays accessible for middle-grade readers while gradually layering in darker stakes, from kidnapping and mind-control to political betrayal and trauma recovery.

The main arc runs through the numbered novels, with Unlocked serving as a hybrid guidebook and novella and Unraveled following fan-favorite Keefe during a crucial stretch of the timeline. Graphic novel adaptations of the first book offer another way into the story for visual readers, but the heart of the series is Sophie’s long journey toward figuring out who she is and how to use her power without losing herself.